Port 26257CockroachDB

CockroachDB's default SQL and inter-node RPC port, using PostgreSQL-compatible SQL and typically TLS in secure deployments.

inDatabases

transport: tcp
in transit: encrypted
assignment: official
risk: 8/10
lookups: 0

also known as CockroachDB SQL, CockroachDB RPC, PostgreSQL-compatible SQL

Technical Details

what runs on :26257

CockroachDB uses TCP 26257 by default for both client SQL connections and inter-node communication; the SQL and RPC listeners can be configured separately. SQL clients use the PostgreSQL wire protocol, including its startup and TLS negotiation, while node-to-node traffic uses CockroachDB's RPC protocol over the listener. Secure deployments use TLS; --insecure disables encryption and authentication. The separate HTTP admin UI is usually on port 8080.

Security Information

exposure of :26257

risk score

8/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

databases averages 3.8 across 172 ports — this one sits 4.2 above.

in transit

encrypted

payloads are protected on the wire

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

This port exposes database access and, by default, cluster communication, so an internet-reachable listener can invite credential attacks and expose data or administrative operations. Keep it on private networks, restrict access with firewall rules, and use secure mode with appropriate authentication; insecure mode provides neither TLS nor authentication.

Record

iana registry entry

port: :26257
service: CockroachDB
transport: TCP
encryption: tls / encrypted
assignment: iana registered
risk: 8/10risk
category: Databases
usage: CockroachDB nodes listen on TCP 26257 by default for SQL clients and cluster communication. Engineers encounter it when connecting PostgreSQL-compatible tools to a self-hosted CockroachDB cluster or allowing traffic between its nodes.
lookups: 0rank 993
added: 2026-10-19
updated: 2026-10-19
references: IANA service name registry — port 26257

Something wrong?

This record is maintained by the engineers who use port 26257. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-19.

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edit this record →back to the registry

Related Ports

all 172 in databases →

the 8 most looked-up other ports in databases — 172 ports carry that label.

port	service	proto	category	risk	views
:8882	Atlasz Secure App Server	TCP	Web Services	caution	66.9k
:9001	ETL Service Manager	TCPUDP	Databases	caution	28.6k
:2484	Oracle SSL Listener	TCPUDPtls	Security	caution	25.0k
:5495	Applix TM1 Admin	TCP	Databases	caution	24.8k
:591	FileMaker Web Sharing	TCP	Web Services	caution	23.1k
:1521	Oracle TNS Listener	TCP	Security	caution	19.6k
:21001	AMLFilter Admin	TCP	Security	caution	19.2k
:18206	Audition FAM DB	TCPUDP	Databases	caution	19.1k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :26257CockroachDB

Technical Details

Security Information

Related Ports

Port 26257CockroachDB